A graduated glass tube with a small aperture and stopcock for delivering measured quantities of liquid or for measuring the liquid or gas received or discharged.

ETYM French, can, cruet, dim. of buire flagon.
Graduated glass measuring tube; Ecclesiastical, sacramental cruet.
In chemistry, a piece of apparatus, used in titration, for the controlled delivery of measured variable quantities of a liquid.
It consists of a long, narrow, calibrated glass tube, with a tap at the bottom, leading to a narrow-bore exit.
Glass tube with a tap; used for titration.

see biretta.

A stiff cap with ridges across the crown; worn by Roman Catholic clergy.
square three-ridged cap worn by Catholic clergy
Roman Catholic, cleric's square cap.